Effects of temperature and wavelength choice on in-situ dissolution test of Cimetidine tablets

Li, Xinxia; Yan, Wang; Xu, Pingping; Qi-zhou, Zhang; Nie, Kun; Xu, Hu; Kong, Bin; Li, Li; Chen, Jian

doi:10.1016/j.jpha.2012.06.001

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…The relationship between SO2 concentration and UV absorbance may be affecte various atmospheric parameters, such as humidity, gas flow rate, and temperature [16 To study the influence of environmental factors, experiments have to be conducted w one varying variable while all other variables are kept under control. To achieve this g a special device was developed for this study, as shown in Figure 2.…”

Section: Control Set-upmentioning

confidence: 99%

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Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration

Wong

2022

Sustainability

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The sulphur dioxide (SO2) concentration can be monitored via its absorbance in the ultraviolet (UV) region. To address the absence of a systematic study on the UV absorbance of varying SO2 concentrations, a multispectral imaging method was implemented in the present study. SO2 concentrations and various environmental conditions were controlled by a purpose-built environmental control system with a light path of 4.2 m. Five narrow-band-pass filters in front of a UV camera were used to implement multispectral imaging. Regression models of the relationship between UV absorbance and SO2 concentration at each wavelength are presented. Their residuals were kept relatively small by adopting Jenks natural breaks analysis, with a maximum standard deviation of 0.086. Temperature and SO2 concentrations were significantly associated with UV absorbance. Furthermore, smoothed look-up tables were developed to explicitly elucidate the correlation between UV absorbance and SO2. These have been represented as heat maps, showcasing an example of library construction using a combination of abundant research data.

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Section: Control Set-upmentioning

confidence: 99%

“…The relationship between SO 2 concentration and UV absorbance may be affected by various atmospheric parameters, such as humidity, gas flow rate, and temperature [16,17].…”

Section: Control Set-upmentioning

confidence: 99%

Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration

Wong

2022

Sustainability

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“…Figure 8 shows the temperature dependence of the spectra, with a lower absorbance signal at room temperature than that at 450 °C. Higher temperatures increase the molecular vibration and rotation movements and therefore increase the absorbance [44]. In order to avoid temperature effects on the absorbance signal, all K-M and baseline scans were acquired at room temperature for analysis.…”

Section: Kubelka-munk Scans and Calibrationmentioning

confidence: 99%

In Situ UV-Visible Assessment of Iron-Based High-Temperature Water-Gas Shift Catalysts Promoted with Lanthana: An Extent of Reduction Study

et al. 2018

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Abstract:The extent of reduction of unsupported iron-based high-temperature water-gas shift catalysts with small (<5 wt %) lanthana contents was studied using UV-visible spectroscopy. Temperature-programmed reduction measurements showed that lanthana content higher than 0.5 wt % increased the extent of reduction to metallic Fe, while 0.5 wt % of lanthana facilitated the reduction to Fe 3 O 4 . In situ measurements on the iron oxide catalysts using mass and UV-visible spectroscopies permitted the quantification of the extent of reduction under temperature-programmed reduction and high-temperature water-gas shift conditions. The oxidation states were successfully calibrated against normalized absorbance spectra of visible light using the Kubelka-Munk theory. The normalized absorbance relative to the fully oxidized Fe 2 O 3 increased as the extent of reduction increased. XANES suggested that the average bulk iron oxidation state during the water-gas shift reaction was Fe +2.57 for the catalyst with no lanthana and Fe +2.54 for the catalysts with 1 wt % lanthana. However, the UV-vis spectra suggest that the surface oxidation state of iron would be Fe +2.31 for the catalyst with 1 wt % lanthana if the oxidation state of iron in the catalyst with 0 wt % lanthana were Fe +2.57 . The findings of this paper emphasize the importance of surface sensitive UV-visible spectroscopy for determining the extent of catalyst reduction during operation. The paper highlights the potential to use bench-scale UV-visible spectroscopy to study the surface chemistry of catalysts instead of less-available synchrotron X-ray radiation facilities.

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Kinetics, thermodynamics and stability constants of aniline oxidative coupling reaction with promethazine: experimental and computational study

Salih,

Kareem,

Jibrael

2023

Reac Kinet Mech Cat

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Effects of temperature and wavelength choice on in-situ dissolution test of Cimetidine tablets

Cited by 5 publications

References 5 publications

Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration

Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration

In Situ UV-Visible Assessment of Iron-Based High-Temperature Water-Gas Shift Catalysts Promoted with Lanthana: An Extent of Reduction Study

Kinetics, thermodynamics and stability constants of aniline oxidative coupling reaction with promethazine: experimental and computational study

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